Adding Entra ID authentication to Python Dash web app in Azure App Service

Question

I have deployed a web app built in Python using the Dash library to Azure App Service. I want to add authentication using Entra ID, but I am getting a 403 error when I try to access the web app and I am not redirected to the Microsoft login page. I have configured the issuer url as https://login.microsoftonline.com/<tenant id>/v2.0 and entered the app id from the app registration created on another Entra ID tenant in the Azure portal. What could be causing the error?

Attached are images of the error and configuration.

Answer 1

Hello @guidofranco
I'm glad that you were able to resolve your issue and thank you for posting your solution so that others experiencing the same thing can easily reference this! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others ", I'll repost your solution in case you'd like to "Accept " the answer.

Issue:

• You deployed a Python web app using the Dash library on Azure App Service and tried to add authentication using Entra ID.
• However, you encountered a 403 error when you tried to access the web app and were not being redirected to the Microsoft login page as expected.
• You configured the issuer URL as https://login.microsoftonline.com/<tenant id>/v2.0 and entered the app id from an app registration created on a different Entra ID tenant in the Azure portal.
• Solution:

You resolved this issue by choosing the " HTTP 302 Found redirect" option for the "Unauthenticated request" requirement for your Python web app in the Azure portal

Best, Grace

Answer 2

I solved it by choosing the first option: HTTP 302